Express’s fiscal fourth-quarter earnings jumped 5.9% amid a rise in revenue that was helped by an extra week in the period, pushing the youth-focused apparel retailer’s results above expectations. However, Chief Executive Michael Weiss warned of a softer start to the new year, reflecting the impact of reduced traffic levels and consumer spending in February. The company guided for full-year and current-quarter per-share earnings below expectations. Shares fell 14% to $16.20.